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Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find (a) the maximum kinetic energy of the photoelectrons and (b) the stopping potential.

Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium ( = 2.5 eV) cathode. Find
(a) the maximum kinetic energy of the photoelectrons and
(b) the stopping potential.

Grade:12

1 Answers

Arun
25763 Points
3 years ago
(a) K.E. = (hc / \lambda)  – \phi0
 = (1242 ev-nm/ 280 nm) – 2.5 ev
 = 1.9 ev
(b) stopping potential is given by
 ev = K.E.max
 V = 1.9 ev / e
 = 1.9 Volt

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